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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
An example keymap.c file (default keymap for the Moonlander): https://github.com/qmk/qmk_firmware/blob/master/keyboards/moonlander/keymaps/default/keymap.c
You can use a GUI to update the keymap without reflashing, google VIA/Vial, or you can use the online QMK tool if you just want to use the simpler features, or you can write a little C.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.